Merge pull request #148 from chewi/bugfix/missing_nlsml_tag

[BUGFIX] Fix menus by adding missing NLSML instance tag
[CS] Shouldn't be swallowing these failures
[FEATURE] Add ComposedPrompt component to FreeSWITCH

Modelled on the Asterisk equivalent. No tests because I'll be crucified if I don't finish this by Monday. :(
[CS] Ben says we shouldn't be swallowing these failures
[BUGFIX] Fix prompt timeouts in FreeSWITCH

It was starting the timer at the beginning of the prompts instead of the end.